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OP - if you want to hear the difference between a plugged and unplugged sound tube check out this binaural in-ear recording done by Winding Road (wear headphones for real-life accuracy). Doesn't seem much quieter but the tone is less harsh with the plug in. Compare 2:24 (plug out) with 5:05 (plug in)::
[ame="https://www.youtube.com/watch?v=LhXZb4vbOog"]2014 Subaru BRZ Stock Test Drive & Sound Tube Trick - YouTube[/ame]
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